While Xojo Inc. just delivered their release 2015r2 version, we still support REALbasic and Real Studio.
The reasons why people don't use the lastest version are very different. Some don't like the new IDE, some have older OS versions or older hardware to support and some don't want to spend money on a new license as long as their existing version works fine. For all of them, we have plugins at hand.
So even our latest addition to the plugin, the markdown classes, are available for REALbasic 2006r4 and even PowerPC. Enjoy it!